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CVE-2021-47669— can: vxcan: vxcan_xmit: fix use after free bug

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在vxcan_xmit函数中释放后重用skb内存。

CVSS 7.8 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux a8f820a380a2a06fc4fe1a54159067958f800929< 6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105 affected
a8f820a380a2a06fc4fe1a54159067958f800929< 9b820875a32a3443d67bfd368e93038354e98052 affected
a8f820a380a2a06fc4fe1a54159067958f800929< a24476b37167816e6352ca1a2cf3769847774f70 affected
a8f820a380a2a06fc4fe1a54159067958f800929< e771a874076115df8bff27d325edfd2340e4ec69 affected
a8f820a380a2a06fc4fe1a54159067958f800929< 75854cad5d80976f6ea0f0431f8cedd3bcc475cb affected
4.12 affected
< 4.12 unaffected
4.14.218≤ 4.14.* unaffected
… +4 more rows
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I. Basic Information for CVE-2021-47669

Vulnerability Information
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Vulnerability Title
can: vxcan: vxcan_xmit: fix use after free bug
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: can: vxcan: vxcan_xmit: fix use after free bug After calling netif_rx_ni(skb), dereferencing skb is unsafe. Especially, the canfd_frame cfd which aliases skb memory is accessed after the netif_rx_ni().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在vxcan_xmit函数中释放后重用skb内存。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux a8f820a380a2a06fc4fe1a54159067958f800929 ~ 6d6dcf2399cdd26f7f5426ca8dd8366b7f2ca105 -
Linux Linux 4.12 -

II. Public POCs for CVE-2021-47669

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III. Intelligence Information for CVE-2021-47669

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Other References for CVE-2021-47669 (5)

Same Patch Batch · Linux · 2025-04-17 · 5 CVEs total

CVE-2021-47670 8.8 HIGH can: peak_usb: fix use after free bugs
CVE-2021-47668 8.8 HIGH can: dev: can_restart: fix use after free bug
CVE-2021-47671 can: etas_es58x: es58x_rx_err_msg(): fix memory leak in error path
CVE-2020-36789 can: dev: can_get_echo_skb(): prevent call to kfree_skb() in hard IRQ context

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47669

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